﻿/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2009 Frederico Caldeira Knabben
 *
 * == BEGIN LICENSE ==
 *
 * Licensed under the terms of any of the following licenses at your
 * choice:
 *
 *  - GNU General Public License Version 2 or later (the "GPL")
 *    http://www.gnu.org/licenses/gpl.html
 *
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 *
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 *
 * == END LICENSE ==
 *
 * Utility functions. (Gecko version).
 */

FCKTools.CancelEvent = function( e )
{
    if ( e )
        e.preventDefault() ;
}

FCKTools.DisableSelection = function( element )
{
    if ( FCKBrowserInfo.IsGecko )
        element.style.MozUserSelect        = 'none' ;    // Gecko only.
    else if ( FCKBrowserInfo.IsSafari )
        element.style.KhtmlUserSelect    = 'none' ;    // WebKit only.
    else
        element.style.userSelect        = 'none' ;    // CSS3 (not supported yet).
}

// Appends a CSS file to a document.
FCKTools._AppendStyleSheet = function( documentElement, cssFileUrl )
{
    var e = documentElement.createElement( 'LINK' ) ;
    e.rel    = 'stylesheet' ;
    e.type    = 'text/css' ;
    e.href    = cssFileUrl ;
    documentElement.getElementsByTagName("HEAD")[0].appendChild( e ) ;
    return e ;
}

// Appends a CSS style string to a document.
FCKTools.AppendStyleString = function( documentElement, cssStyles )
{
    if ( !cssStyles )
        return null ;

    var e = documentElement.createElement( "STYLE" ) ;
    e.appendChild( documentElement.createTextNode( cssStyles ) ) ;
    documentElement.getElementsByTagName( "HEAD" )[0].appendChild( e ) ;
    return e ;
}

// Removes all attributes and values from the element.
FCKTools.ClearElementAttributes = function( element )
{
    // Loop throw all attributes in the element
    for ( var i = 0 ; i < element.attributes.length ; i++ )
    {
        // Remove the element by name.
        element.removeAttribute( element.attributes[i].name, 0 ) ;    // 0 : Case Insensitive
    }
}

// Returns an Array of strings with all defined in the elements inside another element.
FCKTools.GetAllChildrenIds = function( parentElement )
{
    // Create the array that will hold all Ids.
    var aIds = new Array() ;

    // Define a recursive function that search for the Ids.
    var fGetIds = function( parent )
    {
        for ( var i = 0 ; i < parent.childNodes.length ; i++ )
        {
            var sId = parent.childNodes[i].id ;

            // Check if the Id is defined for the element.
            if ( sId && sId.length > 0 ) aIds[ aIds.length ] = sId ;

            // Recursive call.
            fGetIds( parent.childNodes[i] ) ;
        }
    }

    // Start the recursive calls.
    fGetIds( parentElement ) ;

    return aIds ;
}

// Replaces a tag with its contents. For example "<span>My <b>tag</b></span>"
// will be replaced with "My <b>tag</b>".
FCKTools.RemoveOuterTags = function( e )
{
    var oFragment = e.ownerDocument.createDocumentFragment() ;

    for ( var i = 0 ; i < e.childNodes.length ; i++ )
        oFragment.appendChild( e.childNodes[i].cloneNode(true) ) ;

    e.parentNode.replaceChild( oFragment, e ) ;
}

FCKTools.CreateXmlObject = function( object )
{
    switch ( object )
    {
        case 'XmlHttp' :
            return new XMLHttpRequest() ;

        case 'DOMDocument' :
            // Originaly, we were had the following here:
            // return document.implementation.createDocument( '', '', null ) ;
            // But that doesn't work if we're running under domain relaxation mode, so we need a workaround.
            // See http://ajaxian.com/archives/xml-messages-with-cross-domain-json about the trick we're using.
            var doc = ( new DOMParser() ).parseFromString( '<tmp></tmp>', 'text/xml' ) ;
            FCKDomTools.RemoveNode( doc.firstChild ) ;
            return doc ;
    }
    return null ;
}

FCKTools.GetScrollPosition = function( relativeWindow )
{
    return { X : relativeWindow.pageXOffset, Y : relativeWindow.pageYOffset } ;
}

FCKTools.AddEventListener = function( sourceObject, eventName, listener )
{
    sourceObject.addEventListener( eventName, listener, false ) ;
}

FCKTools.RemoveEventListener = function( sourceObject, eventName, listener )
{
    sourceObject.removeEventListener( eventName, listener, false ) ;
}

// Listeners attached with this function cannot be detached.
FCKTools.AddEventListenerEx = function( sourceObject, eventName, listener, paramsArray )
{
    sourceObject.addEventListener(
        eventName,
        function( e )
        {
            listener.apply( sourceObject, [ e ].concat( paramsArray || [] ) ) ;
        },
        false
    ) ;
}

// Returns and object with the "Width" and "Height" properties.
FCKTools.GetViewPaneSize = function( win )
{
    return { Width : win.innerWidth, Height : win.innerHeight } ;
}

FCKTools.SaveStyles = function( element )
{
    var data = FCKTools.ProtectFormStyles( element ) ;

    var oSavedStyles = new Object() ;

    if ( element.className.length > 0 )
    {
        oSavedStyles.Class = element.className ;
        element.className = '' ;
    }

    var sInlineStyle = element.getAttribute( 'style' ) ;

    if ( sInlineStyle && sInlineStyle.length > 0 )
    {
        oSavedStyles.Inline = sInlineStyle ;
        element.setAttribute( 'style', '', 0 ) ;    // 0 : Case Insensitive
    }

    FCKTools.RestoreFormStyles( element, data ) ;
    return oSavedStyles ;
}

FCKTools.RestoreStyles = function( element, savedStyles )
{
    var data = FCKTools.ProtectFormStyles( element ) ;
    element.className = savedStyles.Class || '' ;

    if ( savedStyles.Inline )
        element.setAttribute( 'style', savedStyles.Inline, 0 ) ;    // 0 : Case Insensitive
    else
        element.removeAttribute( 'style', 0 ) ;
    FCKTools.RestoreFormStyles( element, data ) ;
}

FCKTools.RegisterDollarFunction = function( targetWindow )
{
    targetWindow.$ = function( id )
    {
        return targetWindow.document.getElementById( id ) ;
    } ;
}

FCKTools.AppendElement = function( target, elementName )
{
    return target.appendChild( target.ownerDocument.createElement( elementName ) ) ;
}

// Get the coordinates of an element.
//        @el : The element to get the position.
//        @relativeWindow: The window to which we want the coordinates relative to.
FCKTools.GetElementPosition = function( el, relativeWindow )
{
    // Initializes the Coordinates object that will be returned by the function.
    var c = { X:0, Y:0 } ;

    var oWindow = relativeWindow || window ;

    var oOwnerWindow = FCKTools.GetElementWindow( el ) ;

    var previousElement = null ;
    // Loop throw the offset chain.
    while ( el )
    {
        var sPosition = oOwnerWindow.getComputedStyle(el, '').position ;

        // Check for non "static" elements.
        // 'FCKConfig.FloatingPanelsZIndex' -- Submenus are under a positioned IFRAME.
        if ( sPosition && sPosition != 'static' && el.style.zIndex != FCKConfig.FloatingPanelsZIndex )
            break ;

        /*
        FCKDebug.Output( el.tagName + ":" + "offset=" + el.offsetLeft + "," + el.offsetTop + "  "
                + "scroll=" + el.scrollLeft + "," + el.scrollTop ) ;
        */

        c.X += el.offsetLeft - el.scrollLeft ;
        c.Y += el.offsetTop - el.scrollTop  ;

        // Backtrack due to offsetParent's calculation by the browser ignores scrollLeft and scrollTop.
        // Backtracking is not needed for Opera
        if ( ! FCKBrowserInfo.IsOpera )
        {
            var scrollElement = previousElement ;
            while ( scrollElement && scrollElement != el )
            {
                c.X -= scrollElement.scrollLeft ;
                c.Y -= scrollElement.scrollTop ;
                scrollElement = scrollElement.parentNode ;
            }
        }

        previousElement = el ;
        if ( el.offsetParent )
            el = el.offsetParent ;
        else
        {
            if ( oOwnerWindow != oWindow )
            {
                el = oOwnerWindow.frameElement ;
                previousElement = null ;
                if ( el )
                    oOwnerWindow = FCKTools.GetElementWindow( el ) ;
            }
            else
            {
                c.X += el.scrollLeft ;
                c.Y += el.scrollTop  ;
                break ;
            }
        }
    }

    // Return the Coordinates object
    return c ;
}
